Marc and Rick are pushing on opposite ends of the box shown above. Marc is pushing on the box with a force of 5 N. Rick is also pushing on the box with a force of 5 N. In which direction will the box move? A. The box will move towards Marc because he is pushing with more force. B. The box will move up because the forces will be combined. C. The box will move towards Rick because he is pushing with more force. D. The box will not move because the forces are balanced.

Review multiple-concept example 7 in this chapter as an aid in solving this problem. in a fast-pitch softball game the pitcher is impressive to watch, as she delivers a pitch by rapidly whirling her arm around so that the ball in her hand moves in a circle. in one instance, the radius of the circle is 0.626 m. at one point on this circle, the ball has an angular acceleration of 66.1 rad/s2 and an angular speed of 12.6 rad/s. (a) find the magnitude of the total acceleration (centripetal plus tangential) of the ball. (b) determine the angle of the total acceleration relative to the radial direction.